摘要:

The occurrence of atelectasis localised to one lobe of the lung is now so commonly seen that by itself it would hardly be worth recording, although very little has been written on the radiographic appearances of this condition.The cause of the atelectasis is often obscure and is frequently associated with bronchiectasis when it is of long standing, in contradistinction to the acute atelectasis which occurs when one of the main bronchi is obstructed by a foreign body. When such obstruction is removed the lung re-ærates without showing any appreciable visible changes from the normal in the radiogram. Atelectasis is usually seen in the right or left lower lobe, and is represented by a so-called triangular shadow of varying size, according to the degree of atelectasis. It occupies the cardio-phrenic angle and a varying portion of the lower lung field. This shadow is often confused with a mediastinal effusion which has been described as appearing in the anterior or posterior mediastinum on either side, giving a similar triangular shadow. The distinction can easily be made by a study of the radiogram, noting whether the opacity is of homogeneous density or whether the density is uneven and containing clearer spaces which indicate the presence of dilated bronchi.

DOI:10.1259/0007-1285-4-37-30

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

A meeting of the North of England Branch of the British Institute of Radiology was held at the Royal Infirmary, Liverpool, on November 7. Dr. Taylor presided and thirty-one members were present, and several guests.

DOI:10.1259/0007-1285-4-37-31

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

If the electric discharge from a large Ruhmkorff coil is passed through a Hittorf vacuum tube, or through a sufficiently exhausted Lenard, Crookes, or similar tube, and if the tube is covered with a fairly close-fitting envelope of thin black card, it will be found that a paper screen placed near the apparatus and covered with barium platino-cyanide will become brightly luminous and fluorescent. It is immaterial whether the prepared side or the unprepared side is turned towards the apparatus. The fluorescence is still noticeable at a distance of 2 metres from the apparatus. It is easy to establish that the cause of the fluorescence proceeds from the discharge tube and from no other part of the electric circuit.The first remarkable feature about this phenomenon is that we have here an agent that can pass through a black card envelope which is impervious to the visible and ultra-violet rays of the sun or electric arc, and that this agent is capable of producing vivid fluorescence. One was, therefore, led first to investigate whether other bodies possess this peculiarity.

DOI:10.1259/0007-1285-4-37-32

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

The first to find the new planet beyond Neptune was C. W. Tombaugh, at the Flagstaff Observatory, Arizona. But the world grants the chief honour of this discovery to a man who has been dead fourteen years. Percival Lowell discovered this planet mathematically, determined its mass and plotted its orbit from the perturbations of its nearest neighbour. But he himself never found it in the heavens. Tombaugh, in the same observatory, working with a more powerful instrument, searched the skies with photographic plates where Lowell's calculations had shown that another planet should be found—and found it. That Neptune had been discovered, eighty-four years earlier, by precisely the same process in no way detracts from Lowell's achievement, and emphasises the care with which astronomers give honour where honour is due.This mathematical discovery of a planet preceding its physical discovery has an extraordinary parallel in the discovery of the X rays. Two years before Röntgen found and demonstrated these rays, another physicist had discovered them mathematically, had specified their properties regarding reflection, refraction, and the penetration of substances opaque to visible light, and had indicated their exact position in the spectrum beyond the ultra-violet.

DOI:10.1259/0007-1285-4-37-33

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

In the last few years, the physicists have obtained so much new knowledge, and consolidated so much old knowledge, on the ultimate nature of matter, than even their brother scientists find it hard to keep pace with them. Yet it is impossible to understand the interesting theory which Dr. Dirac put forward at the Bristol meeting of the British Association without some knowledge of the earlier stages of the problem.We believe the universe to be constructed of only two entities, namely, matter and radiation, radiation meaning light both visible and invisible. Newton regarded light as a stream of particles. The slant rays of the setting sun, the sunlight which strikes through a hole in the cloud, follow such obviously straight paths that it was natural to regard them as streams of particles shot out from the sun.

DOI:10.1259/0007-1285-4-37-35

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

The Annual Dinner in connection with the 1930 Congress and Exhibition was held at the Trocadero Restaurant on Friday, December 5, 1930. The President of the Institute, Major C. E. S. PHILLIPS, O.B.E., presided over a large company. Among the principal guests were Sir Cuthbert Wallace (Director of the Mount Vernon Hospital), Mr. C. C. Paterson (President of the Institution of Electrical Engineers), Dr. T. Watts Eden (President of the Royal Society of Medicine), Prof. G. P. Thomson and Dr. A. E. Barclay (the Mackenzie Davidson and Silvanus Thompson lecturers respectively), Sir Squire Sprigge (Editor,The Lancet), Dr. Donald Hunter, Dr. H. A. Harris, Prof. J. M. Woodburn Morison (President of the Electrotherapeutics Section of the Royal Society of Medicine), Dr. W. H. Eccles (President of the Institute of Physics), Dr. R. A. Young (President, Medical Society of London), Dr. C. Thurstan Holland, and Mr. C. L. Winch (President of the Society of Radiographers).

DOI:10.1259/0007-1285-4-37-37

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

October 22, 1930. Bemerkung zu der Arbeit von W. Busse: “Ausdehnung und Intensität von Debye-Linien oder Ringen in Abhängigkeit von Röhrenfokus-, Kamera-und Präparat-Dimensionen” (M. A. Bredig).November 5, 1930. Röntgenspektroskopische Messungen der L-Absorption der Elemente 74 Wolfram bis 92 Uran (A. Sandström). Die Struktur der K-Strahlen im ultraweichen Röntgengebiet (M. Söderman).November 14, 1930. Die Richtungsverteilung der von gestreuten γ-Strahlen erzeugten Rückstoffstrahlen (D. Skobelzyn).

DOI:10.1259/0007-1285-4-37-41

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY

摘要:

The following abridgements of recent Patent Specifications have been compiled from the Official Patents Journal by permission of the Controller of H.M. Stationery Office. Printed copies of the full Specifications can, when accepted, be obtained from the Patent Office, 25 Southampton Buildings, London, W.C.2, at 1s. each.

DOI:10.1259/0007-1285-4-37-48

出版商:The British Institute of Radiology    

年代:1931

数据来源: WILEY